Cisco 7206VXR (NPE300) IPv6 Compatibility

Kindly confirm whether the Cisco 7206VXR (NPE300) router (Cisco IOS Software, 7200 Software (C7200-JK9S-M), Version 12.4(19), RELEASE SOFTWARE (fc1)) supports all features of IPv6.

Our current firmware is c7200-jk9s-mz.124-19.bin. Will upgrading the firmware to c7200-jk9s-mz.124-21.bin is enough to get the full feature of IPv6. Also what is the difference between c7200-jk9s-mz.124-21a.bin  &  c7200-jk9s-mz.124-21.bin firmwares.
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I would be best to use the Cisco Feature Navigator to get all the specifics.

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